This is a note to let you know that I've just added the patch titled
netfilter: nat: avoid use of nf_conn_nat extension
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: netfilter-nat-avoid-use-of-nf_conn_nat-extension.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 6e699867f84c0f358fed233fe6162173aca28e04 Mon Sep 17 00:00:00 2001
From: Florian Westphal fw@strlen.de Date: Tue, 28 Mar 2017 10:31:03 +0200 Subject: netfilter: nat: avoid use of nf_conn_nat extension
From: Florian Westphal fw@strlen.de
commit 6e699867f84c0f358fed233fe6162173aca28e04 upstream.
successful insert into the bysource hash sets IPS_SRC_NAT_DONE status bit so we can check that instead of presence of nat extension which requires extra deref.
Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/netfilter/nf_conntrack_core.c | 2 +- net/netfilter/nf_nat_core.c | 18 ++++-------------- 2 files changed, 5 insertions(+), 15 deletions(-)
--- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -689,7 +689,7 @@ static int nf_ct_resolve_clash(struct ne
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); if (l4proto->allow_clash && - !nfct_nat(ct) && + ((ct->status & IPS_NAT_DONE_MASK) == 0) && !nf_ct_is_dying(ct) && atomic_inc_not_zero(&ct->ct_general.use)) { nf_ct_acct_merge(ct, ctinfo, (struct nf_conn *)skb->nfct); --- a/net/netfilter/nf_nat_core.c +++ b/net/netfilter/nf_nat_core.c @@ -550,10 +550,6 @@ struct nf_nat_proto_clean { static int nf_nat_proto_remove(struct nf_conn *i, void *data) { const struct nf_nat_proto_clean *clean = data; - struct nf_conn_nat *nat = nfct_nat(i); - - if (!nat) - return 0;
if ((clean->l3proto && nf_ct_l3num(i) != clean->l3proto) || (clean->l4proto && nf_ct_protonum(i) != clean->l4proto)) @@ -564,12 +560,10 @@ static int nf_nat_proto_remove(struct nf
static int nf_nat_proto_clean(struct nf_conn *ct, void *data) { - struct nf_conn_nat *nat = nfct_nat(ct); - if (nf_nat_proto_remove(ct, data)) return 1;
- if (!nat) + if ((ct->status & IPS_SRC_NAT_DONE) == 0) return 0;
/* This netns is being destroyed, and conntrack has nat null binding. @@ -705,13 +699,9 @@ EXPORT_SYMBOL_GPL(nf_nat_l3proto_unregis /* No one using conntrack by the time this called. */ static void nf_nat_cleanup_conntrack(struct nf_conn *ct) { - struct nf_conn_nat *nat = nf_ct_ext_find(ct, NF_CT_EXT_NAT); - - if (!nat) - return; - - rhltable_remove(&nf_nat_bysource_table, &ct->nat_bysource, - nf_nat_bysource_params); + if (ct->status & IPS_SRC_NAT_DONE) + rhltable_remove(&nf_nat_bysource_table, &ct->nat_bysource, + nf_nat_bysource_params); }
static struct nf_ct_ext_type nat_extend __read_mostly = {
Patches currently in stable-queue which might be from fw@strlen.de are
queue-4.9/netfilter-nat-revert-netfilter-nat-convert-nat-bysrc-hash-to-rhashtable.patch queue-4.9/netfilter-nat-avoid-use-of-nf_conn_nat-extension.patch